Percussive tool



Feb. 26, 1935; T. LEcHELT PERCUssIvE TooL Filed March 1o, 195s Patented Feb. 26, 1935 i UNITED STATES PATENT oFFicE Theodor Lechelt, Amsterdam, Netherlands Application March-1o, 1933. serial No. 660,291

In Germany March 11, 1932 9 Claims. (Cl. ,Z9- 81) This invention relates to rotary percussive the slots is less than the diameter of the plate-` tools such as are used inter alia for cleaning and or disk-shaped ends of the tools but greater than removing rust from surfaces of all kinds, such the `width of thetools where they pass through as boilers, ships hulls andiron constructions, as theV slots, so that .the tools are free to move well as for working concrete or stone and for somewhat in the direction of rotation during use. 5

many other purposes. Percussve tools of this The diameter of the central bore b is somewhat kind are known in which the tools` are expanded greater. than Ithe diameter of the ends e of the into the form of plates at the ends at which they tools so `that the latter can assume a somewhat are clamped `'and are arranged in rows adjacent oblique position in the holder.

lo one another in cylindrical longitudinal grooves in In the embodiment shown, three rows of tools 1o the holder, vthe grooves being slotted longitudi-Y offset `at 120 with respect to each other, are pronally for the introduction of the tools and being vided. vTools are introduced in turn into the closed by means of a cap. This cap is connected three longitudinal slots c with the ends e immediwith a shaft which maybe flexible and is driven ately adjacent or superimposed. However, the

l5 by ,an electric motor for example. A tool of this individual tools din each row are spaced apart l5 type is shown for instance in U. S. Patent No. by an amount equal to twice the thickness of a 1,856,299. l f tool, but in their entirety` the tools constitute a Hitherto the grooves in which the tools were coherent unbrokenworking surface. mounted have been arranged eccentrically with The `possibility of the tools assuming an oblique iirespect to the axis of the tool holder and distance position is afforded only if they are loosely 9,0

pieces provided between the individual tools. In clamped in the tool holder. The length of the this arrangement impact moments arise` which centralboreb is therefore `made somewhat greater render the manipulation more cliicult. In order than the total thickness of the clamping ends of` to overcomethis disadvantage, according to the all the tools. For this purpose also, the closure present invention the ends of all the ktools are discap f of the tool holder is furnished with a ball- 25 posed in a central bore in the tool holder,.i. e., on ended pin g which passes into the central bore b the axis thereof, and abut directly against each and formsan abutment for the tools.

other therein. All the tools are mounted in one and the same Preferably the clamping of the ends of the tools groove in the tool holdeni. e., in the central bore.

in the central bore is effected in such manner that Spacing discs are .dispensed with. Impact forces 30 in the use of the percussive device the tools can such as occur when the tools are arranged ecassume a setting inclined somewhat to the central centrically, cannot arise. The device is therefore axis. This is particularly advantageous if the Very convenient to handle. l device is to be used for operating on riveted iron I Wish it to be understood that I do not limit 5 constructions in which case the rivet heads can myself to the one embodiment of my invention as 35 be treated much more readily by positioning the shown and described merely by way of example. tools obliquely. Various other constructional forms differing from A percussive device according to the invention that one in details are possible, without conis shown by way of example in the accompanying stituting departures from the invention.

drawing in which: I claim: 40

Fig. 1 shows a side view of the device in part 1. A rotary percussive deVCe. Comprising, a section rotary tubular body member having a plurality Fig. 2 is a cross section. of longitudinal slots therein, a plurality of strik- Figs. 3 and 4 show a single tool in two views at ing tools arranged adjacent each other in the right angles. body member and extending through the slots, 45

The tool holder a consists of a hollow cylinder the tools having widened inner ends arranged closed at one end, the walls of which are procoaxially with their centers substantially in the vided with longitudinal slots b corresponding to longitudinal axis of the body member and bethe number of rows of tools and uniformly spaced ing adapted to prevent substantial radial moveperipherally. The central bore b serves to receive ments of the striking tools. 50 the enlarged plateor disk-shaped ends e by 2. A percussive device according to claim l, means of which the tools d are clamped, the tools in which one end of the body member is prod projecting outwardly through the slots c. The vided with means so that the device may be atslots c permit the introduction of the tools from tached to a rotary driving means.

the open end of the tool holder. The width of 3. A percussive device according to claim 1, in

which the body member is closed at one end and the other end is provided with a closure cap having a projection to abut against the adjacent striking tool to maintain the tools adjacent each other.

4. A rotary percussive device, comprising, a rotary tubular body member having a plurality of longitudinal slots therein, the Width of each slot being less than the diameter of the bore of said body member, and a plurality of striking tools arranged adjacent each other in the body member and extending outwardly from said bore through said slots, the tools having widened inner ends arranged coaxially and with their centers substantially in the longitudinal axis of the body member and being adapted to prevent substantial radial movements of the striking tools.

5. A rotary percussive device, comprising, a rotary tubular body member having a plurality of longitudinal slots therein, the width of each slotr being less' than thediameter of-the bore of said body member, `and a plurality of striking tools arranged adjacent each other in the body member and extending outwardly from said bore through said slots, the tools having widened inner ends arranged coaxially and with their centers substantially in the longitudinal axis of the body member and being adapted to prevent substantial radial movements of the striking tools, the breadth of the Shanks of said tools being less than the width of the said slots.

6. A rotary percussive device, comprising, a rotary tubular body member having a plurality of longitudinal slots equally distributed in its periphery, the width of each slot being less than the diameter of the bore of said body member, and a plurality of striking tools arranged'adjacent each other in the body member and extending outwardly from said bore through said slots, the tools having widened inner ends arranged coaxially and with their centers substantially in the longitudinal axis of the body member and being adapted to prevent substantial radial movements of the striking tools.

7. AV rotary percussive device, comprising, a rotary tubular body member closed at one end and open at the other end and having a plurality of longitudinal slots therein, the width of each slot being less than the diameter of the bore of said body member, a plurality of striking tools extending outwardly from said bore through said slots and following one another in the axial direction of the said bore, the size of the inner ends of said tools corresponding to the diameter of the body member bore, and a cap fixed on the open end of the said body member and having an approximately semi-spherical inner projection extending into said open body member and contacting with the rearmost of the inner tool ends.

8. A rotary percussive device, comprising a rotary tubular body member having a plurality of longitudinal slots equally distributed therein, the width of each slot being less than the diameter of the bore of said body member, a plurality of striking tools arranged adjacent each other in the body member and extending outwardly from said bore through said slots in staggered arrangement to be evenly distributed around the said body member, and widened inner ends on said striking tools arranged coaxially and with their centers substantially in the longitudinal axis of the body member and being adapted toV prevent substantial radial movements of the striking tools, the length of the bore being greater than the total thickness of the ends of the tools mounted therein.

9. A rotary percussive device, comprising, a rotary tubular body member closedat one end and open at the other end and having a `plurality of longitudinal slots equally distributed in its periphery,the width of each slot being less than the diameter of the body of said body member,

a plurality of striking tools extending outwardly from said bore through said slots and following one another in the axial direction of the said bore, the breadth of the shanks of said tools being less than the width of the said slots, and the size of the inner ends of the said tools corresponding to the diameter of the body member bore, the length of the bore being greater than the total thickness of the ends of the tools mounted therein, and a cap fixed to the open end of said body member and having an approximately semi-spherical inner projection extending into said open body member and contacting with the rearmost of the inner tool ends.

THEODOR LECHELT. 

